Markdown to HTML

How Markdown to HTML works

Convert Markdown headings, emphasis, links, lists and blockquotes into clean HTML. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

What it converts

Headings, bold, italic, inline code, links, lists, blockquotes, horizontal rules and fenced code blocks. The conversion runs with regular expressions in the page, so it is instant and works offline.

Inline formatting is processed before block structure, which is what stops a bold marker inside a list item from breaking the list.

Where a regex converter stops

This is deliberately not a full CommonMark implementation. Tables, footnotes, reference-style links, nested lists beyond one level and escaping rules for literal asterisks are not handled, and deeply nested structures can produce output that looks right and nests wrong.

For a README, a comment or a quick draft, that is enough. For a documentation site, use a parser that follows the specification.

Escaping and safety

Raw HTML in the input passes through, which is convenient and dangerous: paste untrusted Markdown into a page that renders the output and you have an injection risk. Sanitise the result before putting it on a public page.

Text that looks like markup must be escaped to display literally — a less-than sign in prose will otherwise start a tag.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions